Patent GB-719207-A (GB)
Title: Improvements in venetian blinds
IPC: E06B9/303
Filed: 1953-01-30
Abstract: 719,207. Venetian blinds. BERGLIND, G. Jan. 30, 1953 [Feb. 1, 1952], No. 2786/53. Class 20 (3) Venetian blinds are manipulated by a single pair of operating cords 10, 11, so that by pulling one cord or the other the angle of tilt of the laths is adjusted in one direction or the other while by pulling both cords simultaneously the tilt adjusting device is not actuated but the blind is raised. The blind comprises a head rail 1 and a number of laths 4, 5, &c., carried by tapes 6-8 and 6'-8', each tape terminating at its upper edge with a ring, not shown. The head rail 1 accommodates a pulley 20 round which runs a looped cord 22,. 23, one run 10 of the adjusting cord 10, 11, being looped round a small pulley wheel 24 clamped to one side 22 of the looped cord 22, 23, and passed down through a hole 13 in the head rail 1, and the other run 11 of the adjusting cord 10, 11, being looped round a small pulley wheel 25 clamped to the end of the other side 23 of the looped cord 22, 23, and passed down through an opening 18 in the head rail 1. The runs 10, 11, pass through the laths 4, 5, &c. adjacent their side edges, and are connected to a bottom lath of stronger construction, not shown. Strings 33, 35, 37, connected at their lower ends to the rings at the top of the tapes 6, 7, 8, pass through holes 12, 15, 17 respectively in the head rail 1 and have their upper ends clamped at 24, 42, to the side 22 of the looped cord 22, 23, strings 34, 36, 38 being connected between the rings at the tops of the tapes 6', 7', 8' and clamps 41, 43, 25, on the other side 23 of the looped cord 22, 23 and being pushed through holes 14, 16, 19, respectively in the head rail 1. The angle of the laths can be adjusted to slope in either direction at the required angle by pulling the appropriate run 10 or 11, of the operating cord, the runs 22 and 23 of the looped cord thus being moved in opposite directions to raise, or lower, one set of strings 33, 35, 37 at the front of the blind and correspondingly lower, or raise, the strings 34, 36, 38 at the back of the blind. A ball 44, adapted to lie in the crest of the loop of the operating cord 10, 11, when the laths are horizontal indicates the tilt of the laths. In a modification, Fig. 12, the looped cord 22, 23, is passed round the larger wheel of a stepped pulley 20' and is provided with rings 24, 25, at its ends. Strings 22', 23' connected at 49, 50, to the sides of the head rail 1 are looped through the rings 24, 23, on the ends of the cord 22, 23, and carry rings 24<SP>1</SP>, 25<SP>1</SP> at their free ends. The run 10 of the operating cord 10, 11, passes round a pulley 39, through the ring 24', round a second pulley 51, and down through a hole 13 in the head rail 1, the other run 11 passing round a pulley 40 through the ring 25<SP>1</SP> and down through a hole 18 in the head rail 1. Operating strings 33, 34, 37, 38 passing down through the head rail 1 through holes 12, 14, 17, 19 respectively, for connection to corresponding tops of pairs of tapes adjacent each side edge of the laths, are passed round the smaller wheel of the stepped pulley 20' so that by pulling one of the runs 10 or 11, of the operating cord the pulley 20<SP>1</SP> is rotated in the appropriate direction and the strings 33, 34, 37, 38 are given a corresponding movement which adjusts the angle of the laths. Pulling both runs of the operating cord 10, 11 raises the blinds as previously described. For fastening the operating cord in its adjusted position a rope clip fastener 48 is provided. In a further modification the rings 24<SP>1</SP>, 25<SP>1</SP> are omitted and the runs 10, 11 of the operating cord are passed through the rings 24, 25 at the ends of the cord 22, 23, the strings 33, 34, 37, 38 being passed round the pulley 20 which is of uniform diameter.